On the warm side ounds like a lean pilot circuit. What jet do you have installed in the pilot circuit? Have you tried to adjust mixture screw?

What is the condition of the air filter? Do you have an in-line fuel filter?

It could also be a vacuum leak.

I call that normal.
I either raise the idle or hold the gas a big when cold, I.E., not warmed up.
If I drive away with the, off choke, engine idling at recommended R.P.M.s , I have to dial it back in fifteen minutes,

It's just a biggass lawnmower motor, with a carburetor.

Typical air-cooled engine issue.  As the engine gets hotter and hotter The A/F ratio gets lower and lower (richer) to a point.  If the engine gets very hot and/or the ambient air temperature gets very hot it will run rich.

When it's colder my idle mixture screws are further out.  When it's hotter my idle mixture screws are further in.  The rest is compensated by way of idle speed screws.

Even if your jetting is spot on one day it can be off another day.  It is always a compromise, especially with air-cooled engines...

Maybe not helpful, but I had issues with my bike stalling after I would come down a long straight run to a stop.  I ended up realizing that I had shaved the needle washer too much thus raising the needle too far, which caused a slightly rich condition at ~1/4 throttle when transitioning from running speed to idle.  The longer downhill with the bike  slowly idling to a stop allowed the vacuum to keep the slide slightly open and fuel to build up in the carb to a point it choked (flooded) the engine out. I would have have a hard time restarting it and when it finally did, I would have to get hard on the throttle to blow out all of the excess fuel in a nice little plume of smoke.  I dropped the needle back down a bit so the bike is no longer too rich at that ~1/4 throttle position (or thereabout) and it doesn't stall at idle any longer.

Your situation may be different, but that's my experience I can share.

Thanks for the reply's. I will check my needle jet. I dont notice excess smoke but it does want to stall after releasing throttle from cruising. Stewmills you may be onto something. I used washers in place of shaving my white spacer so Ill remove one to slightly lean it out. Gary I don't have a tach so I ear tach it against youtube videos and my sporty at 1000 rpm's but that can be slightly difficult since they sound different. Maybe I should get one. It would also seem 1000 rpms is too low compared to yours so my high idle may actually be a more correct speed.

I appreciate everyone's input, thank you.

I believe that some on the forums use an app to check rpm. Does anyone have details on that?

WunGun wrote on 07/04/19 at 11:47:08:

Thanks for the reply's. I will check my needle jet. I dont notice excess smoke but it does want to stall after releasing throttle from cruising. Stewmills you may be onto something. I used washers in place of shaving my white spacer so Ill remove one to slightly lean it out.

Sorry I didn’t pick up on this yesterday. The needle circuit has nothing to do with idling. I would focus on cleaning the carb, especially the enrichment circuit. You never told us, what jet do you have installed in the pilot circuit and how many durns out is your mixture screw?